Merge pull request #42748 from dcbw/cfssl-localup

Automatic merge from submit-queue (batch tested with PRs 43866, 42748)

hack/cluster: download cfssl if not present

hack/local-up-cluster.sh uses cfssl to generate certificates and
will exit it cfssl is not already installed.  But other cluster-up
mechanisms (GCE) that generate certs just download cfssl if not
present.  Make local-up-cluster.sh do that too so users don't have
to bother installing it from somewhere.

hack/make-rules/verify.sh

@@ -19,7 +19,7 @@ set -o nounset
 set -o pipefail
 
 KUBE_ROOT=$(dirname "${BASH_SOURCE}")/../..
-source "${KUBE_ROOT}/cluster/lib/util.sh"
+source "${KUBE_ROOT}/hack/lib/util.sh"
 
 # Excluded checks are always skipped.
 EXCLUDED_CHECKS=(